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根据所给句子的提示,在下面方格内填入适当的字母,使每竖行成为第一册Unit 17～19里所学的单词,然后再将这些词填入相对应的句子中,使句意完整:
According to the hints of the given sentence, fill in the appropriate letters in the lower square so that each vertical line becomes the word learned in the first volume Unit 17-19, and then fill these words into the corresponding sentence, so that The sentence is complete: